ショルツ star
| WISE J072003.20-084651.2[1] | |
|---|---|
| Temporary mark, another name | 2MASS J07200325-0846499 |
| Constellation | Monoceros |
| Apparent magnitude (V) | 18.3[2] |
| Classification | Binary system of a red dwarf and the brown dwarf |
| Discovery | |
| Detector | Ralf-Dieter Scholz |
| Discovery method | From an observation result of WISE |
| Position Epoch: J2000.0 | |
| Right ascension (RA,α) | 07h 20m 03.254s [1] |
| Declination (Dec,δ) | -08° 46′ 49.90″ [1] |
| Radial velocity (Rv) | 83.1 km/s[2] |
| Proper motion (μ) | Right ascension: -36 milliseconds / year [1] Declination: -102 milliseconds / year [1] |
| Annual parallax (π) | 166+-28 milliseconds |
| Absolute magnitude (MV) | 19.4[3] |
| Physical property | |
| Mass | 0.15M☉[2] |
| Spectral class | M9 +-1 [2] T5[2] |
| Age | 3,000,000,000-10,000,000,000 years [2] |
| The other name | |
| The other name | |
| ■Project ■ Template | |
A ショルツ star [5] (Scholz's Star, another name WISE 0720-0846, WISE J072003.20-084651.2[4]) I belong to とは, Monoceros and am binary system in the distance of 17-23 light-year (5.1-7.2 parsec) from the solar system [2].
Table of contents
Summary
The main star of the binary system is spectral class M9 +-1, and mass is a red dwarf of the 86+-2 Jupiter mass [2], and probably the subordinate star is a brown dwarf of the T5 type, and mass is 65+-12 Jupiter mass [2]. It becomes the 0.15 sun mass in the whole binary system [2]. Approximately 0.8 au [2], the apparent class of the binary system are 18.3 [2] and do not show the distance between both heavenly bodies by the naked eye. The age is calculated from 30 with 10 billion years [2]. 80 stars system is to exist than this system near the sun when I estimate distance as 166 milliseconds angle in annual parallax of this binary system [6].
Discovery
As for what these heavenly bodies discovered when the sun was a fixed star of neighboring, [4], the study were published in arXiv in astronomer Ralph = Dieter ショルツ (Ralf-Dieter Scholz) of Potsdam heavenly bodies physics laboratory (AIP) in November, 2013. These heavenly bodies came to be called by a nickname of "ショルツ star" (Scholz's Star) afterwards.
Approach with the solar system
When the ショルツ star system passed the distance of 52,000 aus (0.25 parsec, 0.82 light-year) now from the sun approximately 70,000 years ago, is calculated [2]; [4]. This distance is the outside domain of the cloud of オールト assumed as the origin of a long periodic comet and the non-periodic comet. In addition, a comet is temporarily said from a cloud of オールト under the influence of ショルツ star system even if scattered that I need 2 million years to reach inside of the solar system [2]. The apparent brightness from the earth is regarded as a 11.4 class when this star reached its closest point to the sun [3]. It is thought that the event that a fixed star comes close to the solar system to distance equal to the ショルツ star 70,000 years ago is taking place at around one time of frequency for 9 million years [2].
Source
- ^ a b c d e f g "2MASS J07200325-0846499 - - Brown Dwarf Candidate". SIMBAD. February 21, 2015 reading.
- ^ a b c d e f g h i j k l m n o p q Mamajek, Eric E.; Barenfeld, Scott A.; Ivanov, Valentin D. (2015). "The Closest Known Flyby of a Star to the Solar System." The Astrophysical Journal 800 (1). arXiv: It is doi: 1502.04655 10.1088/2041-8205/800/1/L17.
- ^ a b Mamajek, Eric. "FAQ". February 18, 2015 reading.
- ^ a b c d "Closest known flyby of star to our solar system: Dim star passed through Oort Cloud 70,000 years ago." ScienceDaily. (February 17, 2015)m February 21, 2015 reading.
- ^ ""The ショルツ star" which approached to great approach, オールト cloud 70,000 years ago". AstroArts (February 20, 2015). February 21, 2015 reading.
- ^ "THE ONE HUNDRED NEAREST STAR SYSTEMS." RECONS (Research Consortium On Nearby Stars). February 18, 2015 reading.
This article is taken from the Japanese Wikipedia ショルツ star
This article is distributed by cc-by-sa or GFDL license in accordance with the provisions of Wikipedia.
In addition, Tranpedia is simply not responsible for any show is only by translating the writings of foreign licenses that are compatible with CC-BY-SA license information.
0 개의 댓글:
댓글 쓰기